Cold iron sand core and method for producing air cylinder cover by using cold iron sand core

Abstract

The invention discloses a cold iron sand core. The cold iron sand core comprises following components in a ratio of all the components: gray iron cuttings, crude sand, furan resin, a curing agent and iron oxide in the ratio of 90 to 10 to 1.5 to 0.6 to 1.3. The invention further discloses a method for producing an air cylinder cover by using the cold iron sand core. The method comprises the following steps: preparing an aluminum cold core box mould; producing the cold iron sand core; producing an automobile engine air cylinder cover sand mould and a pouring system; forming an air cylinder cover blank casting. According to the cold iron sand core, a cast iron cutting mixture, namely the old iron sand core, is utilized, so that the cooling speed of castings is adjusted and the castings tend to be condensed at the same time, and furthermore, casting shrinkage cavities, shrinkage porosity, deformation and crack defects of the castings are prevented from occurring, matrix structures of cylinder castings can be thinned and the quality effect of the castings is improved. Meanwhile, the effects of cyclically and comprehensively utilizing waste cuttings to generate the cold iron sand core and saving the cost are also realized.

Description

technical field [0001] The invention relates to a chilled iron sand core, and also relates to a method for making a cylinder head by using the chilled iron sand core, which belongs to the technical field of casting. Background technique [0002] The engine cylinder head plays a very important role in the entire engine system. It is an important structural component of the internal combustion engine. Its function is to seal the cylinder and form the combustion chamber. material requirements. The traditional automobile engine cylinder head is made of high-strength die-casting aluminum, but the production cost of die-casting aluminum is high, and the tensile strength and wear resistance of the cylinder head are not as superior as cast iron QT600-3, so cast iron QT600-3 is still used for large displacement . [0003] The engine cylinder head is a typical thin-walled complex casting, and the final pass rate of this type of casting in many factories is only about 50%. The...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a chilled iron sand core and a method for making a cylinder head using the chilled iron sand core. The chilled iron sand core is used in conjunction with the riser to overcome the problem of thick and thin walls at the same time. The solidification time difference strengthens the directional solidification conditions of castings, makes castings tend to solidify at the same time, and prevents shrinkage cavity, shrinkage porosity, casting deformation and crack defects